Assurances from the White House doctor haven't put to bed concern that Donald Trump might not be mentally fit for office.

His physician faced the media yesterday after putting the President through his first official annual medical check-up.

There's been heightened interest in his health since claims made in the book Fire and Fury that Trump might be suffering from learning difficulties, ADHD or even dementia.

USA Today political correspondent Paul Singer said the President asked for, and passed, a standard cognitive test given to senior citizens.

However, he told Nadine Higgins people are concerned he is temperamentally unfit, not mentally unfit.

"I think what the doctor's physical tells us is that there may be nothing wrong with Donald Trump's brain, he may just be a jerk."

LISTEN TO PAUL SINGER TALK WITH NADINE HIGGINS ABOVE